This week on television, one of the longest will-they-won't-they couples ties the knot. There are tense hostage crises on Adventure Time and one other show. Futurama helps you figure out how to vote in the upcoming Presidential election. Tron: Uprising has the most thought-provoking storyline yet. Oh, and Syfy's latest Saturday night movie has possibly the greatest supporting cast of all time.

Plus we learn how to hunt for UFOs, and what it means when we say something is nothing. Check out tons of preview clips and details, below.

Top image: My Babysitter's A Vampire.

Today:

Adventure Time (7:30 PM, Cartoon Network):
Jake is forced to dress as a milkman, to infiltrate a cookie hostage situation, as you can see in our clip at left. Here's the skinny:

Finn and Jake are called on to solve a Candy Kingdom hostage crisis when a rogue cookie takes over.

Carter's honeymoon with Allison is complicated by saboteurs in Eureka.

Check out a sneak peek, in which Jo finds a mysterious file and uncovers a spy ring.

Teen Wolf (10 PM, MTV):
In "Venomous":

Derek is sure that Lydia is the shape-shifter, and asks Scott to help him find out. Meanwhile things develop with Jackson, as the bite begins to show promising effects. The shape-shifter could possibly be a woman.

And check out a sneak peek!

Also on TV tonight: A brand new (to Americans) Lost Girl on Syfy at 10 PM.

Tuesday:

Level Up! (8 PM, Cartoon Network):
It's "Conspiracy Club," in which there's a new club at the school dedicated to hunting down conspiracies. And our heroes have to join this club to see how close they are to exposing the guys' secrets, like that monsters are escaping from video games and stuff.

Also on TV tonight: A new Total Drama on Cartoon Network at 7:30 PM.

Wednesday:

Johnny Test (7:30 PM, Cartoon Network):
This one has an especially auspicious title:

"It's an Invasion, Johnny!; Johnny vs. the Tickler": Johnny springs to the rescue when a distress signal is sent from outer space. Then, Johnny duels with the Tickler when the villain targets Susan and Mary for elimination.

Iron Man: Armored Adventures (8:30 PM, Nicktoons):
It's "Rage of the Hulk!" Because we can always use more Hulk action on television, to tide us over until Guillermo del Toro's TV show finally gets greenlit. Here's what it's about: "Iron Man has to restrain the Hulk in order to help him."

Futurama (10 PM, Comedy Central):
Waiting for Futurama's spoof of the presidential election? Wait no longer! It's "Decision 3012" — can you afford not to vote for Tricky Dick?

The 3012 earth presidential election is underway and Richard Nixon's head faces a very tough opponent in the debate. Leela decides to participate in the campaign as a secretary

And it sounds like if people vote the wrong way, then Bender finally gets to destroy all humans. Check out a clip at left.

Through The Wormhole with Morgan Freeman (10 PM, Science):
"What is Nothing?" This is the sort of question that will make you want to jump right into a wormhole after Morgan Freeman. Here's more info, from the Science website:

When you think about nothing, does that make it something? Can there ever be such a thing as nothing? Physicists regard the true nature of nothingness as one of the biggest mysteries of the Universe. And now their work to try to understand what "Nothing" really is may finally uncover what our Cosmos is made of, how it came from nothing 13.7 billion years ago, and when it might collapse into a purely empty void once again.

Einstein showed us that empty space was really a force field that holds the entire universe together with gravity. Quantum Mechanics predicts that empty space is not actually empty. In every corner of the Universe there are tiny ripples of energy. Many physicists believe this energy is unstable. It might collapse, taking everything in the Universe down with it, or it could explode, with similarly devastating results.

But understanding the baffling paradox of nothing may be a matter of perspective. One Nobel Prize winning physicist believes nothing might be a lack of information. Another scientist believes an entire world of nothingness envelopes our material worldâ€"made of Dark Matter. And another thinks he may be able to solve how our entire Universe can come from absolutely nothing. The quest to understand nothing is uncovering the very foundation upon the entire Cosmos is built. At stake is nothing less than the secret of life, and death, of our Universe.

Thursday:

Turner Classic Movies Marathon (6 AM, TCM):
TCM is showing 12 hours of classic 1960s science fiction/horror movies, including the original Time Machine, plus War of the Planets, Wild, Wild Planet, Five Million Miles to Earth and The Green Slime. Time to call in sick?

Dragon Ball GT (8 PM, Nicktoons):
"The Return of Uub." It's a catchy title, but can this episode deliver? You bet! Here's what to expect:

Can Uub defeat the powerful Baby Vegeta or will others get in his way?

When Beck's identity disc is stolen, his memory starts to unravel. Before he loses his memory forever and becomes a stray, he and Tron set out to infiltrate the crime-ridden underbelly of Argon to find his disc. A mysterious program named Lux guides Tron and Beck through the complex world of Purgos and its menacing criminal gangs. Tron and Beck must track down the disc before the Occupation finds it and discovers Beck's alter-ego as The Renegade.

That's a pretty interesting-sounding storyline, actually. That's followed by a new episode of the dystopian future cartoon Motorcity.

Saving Hope (9 PM, NBC):
Here's what to expect from "The Fight":

A sleep-deprived Alex (Durance) takes on a night shift in the ER where an all-star hockey enforcer may be skating full-speed towards an early death. Meanwhile, Charlie meets a suburban punk who is facing the biggest fight of his life.

All they really had to say was "suburban punk," and I'm already setting my TiVo.

Also on TV tonight: There's a brand new Burn Notice on USA at 9 PM. And a new Wilfred on FX at 10 PM.

Friday:

My Babysitter's a Vampire (8 PM, Disney):
Remember this show? It's back! And Sarah's meeting with the vampire council, referred to as the V Club, presumably to talk about whether vampires really ought to be babysitting anybody. Someone needs to mash this show up with True Blood, for some particularly excellent fan-vid action.

Chasing UFOs (9 PM, National Geographic):
No longer are we going to just sit there and watch the UFOs go past. Now, we're actually going to go after them. Here's the deets:

In National Geographic Channel's new eight-part series Chasing UFOs, join a team of pioneering investigators pushes the limits to find the truth behind unexplained UFO sightings. Are we being watched? Is the government hiding information on UFO happenings? Can this team use science and technology to explain mysterious sightings or will the evidence truly be out of this world? These burning questions motivate the Chasing UFOs investigative team to travel far and probe deep into a number of strange encounters previously left unanswered.

And there's a second episode at 10 PM.

Gravity Falls (9:30 PM, Disney):
Remember this show, which they had a sneak peek of a couple weeks ago — with Kristen Schaal and Jason Ritter as twins who go to live with their eccentric Great Uncle Stan in a town full of monsters? Now it's back, in its regular timeslot. Here's what's happening in "The Legend of the Gobblewonker":

When Dipper and Mabel hear rumors that a sea monster lives at the bottom of the local lake, they enlist Soos to take them on a boating expedition to prove it really does exist.

Saturday:

Bigfoot (9 PM, Syfy):
If you weren't thrilled enough with the last few shark films, Syfy wants you to watch some sasquatch. Unfortunately, they're trying to repeat the whole "Debbie Gibson Vs. Tiffany" stunt they pulled off a year or two ago, except with... well, read for yourself:

Television legends Danny Bonaduce (The Partridge Family) and Barry Williams (The Brady Bunch) star as life-long rivals battling over Bigfoot. Howard Hesseman (Head of the Class), Sherilyn Fenn (Twin Peaks), Andre Royo (The Wire) and Rock and Roll Hall of Famer Alice Cooper (School's Out) co-star in the movie, which is directed by Oscar and Emmy nominee Bruce Davison (X-Men). Bigfoot is a production of The Asylum.

At least Sherilyn Fenn, Andre Royo and Alice Cooper are in it! (Plus Howard Hesseman, aka Dr. Johnny Fever — but they don't mention him in the press release.)

Also on TV tonight: A brand new Kaijudo: Legend of the Duel Masters on The Hub at 8 PM. And there's another Gravity Falls on Disney at 9:25 PM — guest-starring Larry King and Coolio!

Sunday:

Ultimate Spider-Man/Avengers (11 AM, Disney XD):
First in Ultimate Spider-Man, Peter Parker wants some "Me Time": And then on Avengers, Captain America has been a prisoner of the Skrulls for months — but escaping means defeating the Super-Skrull.

Falling Skies (9 PM, TNT):
After last night's pretty brutal episode, this show continues... with a bit of a mixed bag, really. It starts off with a great action sequence, and there are some amazingly creepy scenes, including an up-close look at just what's involved in the "harnessing" process. But it's also probably the weakest episode of the show's second season thus far. Here's what to expect:

Ben and Hal go on patrol and help a boy, only to have their bikes stolen. The subsequent search for the bikes leads to a major discovery. Meanwhile, Matt steps into a dangerous situation; and Weaver reconnects with a family member.

True Blood (9 PM, HBO):
If you've been feeling as though what this show really needs is more Bill and Eric in bondage harnesses — then voila! It's "We'll Meet Again":

Eric and Bill are afraid for their lives; Sookie opens up to Alcide; Lafayette endangers Sookie; Roman and Salome search for a traitor in the council; Andy and Jason go to a party; Terry has a flashback; Sookie drowns her sorrows.

Also on TV tonight: There's a new Aqua Teen Hunger Force at midnight on Adult Swim, followed by a new Metalocalpyse at 12:15 AM.